create_artifact_papal_tiara_effect

create_artifact_papal_tiara_effect = {
	# Get the character the artifact is being made for.
	$OWNER$ = { save_scope_as = owner }
	set_artifact_rarity_illustrious = yes

	# Create the artifact
	create_artifact = {	
		name = papal_tiara_name
		description = papal_tiara_description
		template = papal_tiara_template
		type = helmet
		visuals = pope_tiara
		wealth = scope:wealth
		quality = scope:quality
		history = {
			type = created
			date = 800.1.1
			recipient = character:7862 #Leo III - fictitious date, probably somewhere between the 8th and 9th centuries
			location = province:2575 #Rome
		}
		modifier = artifact_monthly_piety_4_modifier
		save_scope_as = newly_created_artifact
		decaying = no
	}

	scope:newly_created_artifact = {
		set_variable = { name = historical_unique_artifact value = yes }
		set_variable = {
			name = artifact_succession_title
			value = title:k_papal_state
		}
		set_variable = {
			name = pope_hat
			value = yes
		}
		add_artifact_title_history = {
			target = title:k_papal_state
			date = 816.6.12
		}
		add_artifact_modifier = artifact_monthly_learning_lifestyle_xp_2_modifier
	}
}

As written in game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.